Love this ARKit demo (courtesy of Made With ARKit) that allows you to play Tic-Tac-Toe in AR wherever your'e standing.
Best part? It's open-source, so you can download the repo & play yourself! Not available on an App Store yet, playable only if you know how to run it directly from the repo onto your phone.
Ramp
Tana
Ramp
Tana
MailKing by cloudHQ
ZEPETO
Polycam Sharing
Corkdork